Adapter for mounting toric tools on lens-grinding machines.



1. H. PEARSON.

ADAPTER FOR MOUNHNG TORIC TOOLS 0N LENS GRWDING MACHINES.

APPLICATION FILED NOV. 8. 1915 1,236,474. 1 Patented Aug. 14,1917.

2 SHEETS-8HEET I.

I N YE N TOR L ofin //arre Pear-s on A TTORNEY ATTORIVEVJ 2 SHEETSSHEET 2.

nwmron 179 70 Mirna/H460 Patehted Aug. 14, 1917.

J. H. PEARSON.

APPLICATION FILED NOV. 8, I915.

ADAPTER FUR MOUNTING TORIC TOOLS 0N LENS GRINDING MACHINES.

(ii page and I do hereby declare that the .foll 9\y;ing

"is a; tiiradetl holth g and centrally from said plate 11 with a is a full, clear, and exaet glesoripti n there of, reference being had to the accompanying drawings, in which like letters refer to like parts.

The object of this invention is the accurate mounting of toric tools in lens grinding machines so that the proper axes will be given to the lenses ground thereby. -Heretofore there has always been difiiculty and liability of inaccuracy in the mounting of toric tools in lens grinding machines.

The invention herein is for attaching to and securing in connection with a lens grinding machine; a toric tool holder. The toric tools are first mounted in the toric tool holder by a. separate machine, not here shown, called a toric tool protractor, which sets the tools in the holder in proper posi; tion for accurate grinding of the lens.

Therefore, the chief feature of the invention herein is the provision of an adapter or means in said lens grinding machine for the ready and proper mounting of said toric tool holder so as to establish and'maintain the position of the toric tools in the lens grinding machine in accurate positions with reference thereto so that the proper surface will be round on the lenses.

The 1111 nature of the invention will be understood from the accompanying drawings and the following description and claims:

In the drawings, Figure 1 is a vertical section through the frame of the lens grinding machine and showing in side elevation the attachments thereto including said adapter and lens tool holder in place. Fig. 2 is a front elevation of the tool holder and toric tools. Fig. 3 is a front elevation of an adapter plate. Fig. 4 is a section on the line 44 of Fig. 3. Fig. 5 is a front elevation of the machine.

There is shown herein a lens grinding machine 10 of one type, although the invention is not limited to any particular type of lens grinding machine. To the frame 10 of said washer 17 and a nut 18 thereon.

There are shown herein two toric tools 20 of usual type mounted on a tool holder 21, one tool near each end. The shank of the tool extends down into a hole 22 near each end of the machine and is held clamped therein by a set screw 23. The tools have been. properly located in said tool holder previous to the mounting of said tool holder in the lens grinding machine. Said tool h zllder has a central recess 24 in its under $1 e.

The tool holder is applied to the machine by placing it upon the adapter plate 11, the tool holder resting centrally upon the bolt 16 so that said bolt extends through -the opening 24 in the tool holder and the lower edges ofthe ends of the tool holder rest upon the stop pins 15. Then the nut 18 on the bolt 16 is tightened for clamping the tool holder in connection with the adapter plate. This brings the tool into proper position with relation" to the lens holder 14 for grinding the lens so that it will have the proper axis. The parts are so arranged and formed that they can be readily mounted and dismounted for facilitating the grinding of toric surfaces on lenses. 0 r each toric tool an arm 30 projects ho 'zontally outward from the frame 10 for holding the lens holding pins 14 and for giving the lens the proper movement on the surface of the toric tool 20, as is well known to those skilled in the art and may be effected by the structure shown within the frame 10 or any other suitable mechanism.

The outer ends of the arms 30 are held down by the springs 31 acting a ainst the collar 32 and rods 33, which latter ear upon the arms 30. The rods 33 are vertically movable through the head 34 on an arm 35 vertically adjustable on a bar 36 fulcrumed at 37 to a bracket 38 extending upwardly from the frame 10. A leather strap or belt 39 extends from the arm 30 up from the arm 35 to loosely limit the vertical movement of the arm 35.

The invention claimed is:

1. The combination with the frame of a lens grinding machine, of a toric tool holder, means for adjustably clamping toric tools therein, a plate removably secured to the frame and having surfaces on which said toric tool holder can rest, and means for clamping the tool holder to said late.

2. The combination with the rame of a I lens grindin machine, of a toric tool holder,

means for c amping a toric tool therein, a plate secured to the frame with a bolt pro- 'ecting therefrom to receive the toric tool older, "a stop pin projecting from said plate at a point beside said bolt and upon which the toric tool holder may rest, and a nut von said bolt for clamping the toric tool holder in connection with said plate.

3. The combination with the frame of a lens rinding machine, of a holder adapted to hold a toric tool ateach end thereof and haying a recess between the ends thereof, means for clamping the two toric tools in said holder, a plate secured to the frame, a

threaded bolt projecting therefrom to .extend through the recess in said toric tool holder, a stop pin on said plate on each side of said bolt upon which the ends of the toric tool holder may rest, and a but on said bolt for clamping said tool holder to said plate.

In witness whereof, I have hereunto affixed my signature in, the presence of the witness herein named.

JOHN HARVEY PEARSON.

Witness:

J. H. WELLS. 

